Single_cell_meter_amplifier

Published:2009/7/24 3:01:00 Author:Jessie | From:SeekIC

Accuracy for this meter amplifier can be maintained over a 15°C to 55°C range for a full-scale sensitivity of 10 mV to 100 mA. Offset-voltage error is nulled with R5, and bias current is balanced out with R4. Both offset and bias are operated from the reference, and are generally unaffected by changes in battery voltage, so frequency adjustments should not be necessary. Total current drain is under 0.5 mA, giving an approximate life of 3 to 6 months with an AA cell, or over one year with a D cell.



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